+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   77P/Longmore Classification: Jupiter-family Comet          SPK-ID: 1000059 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] alternate orbits: [epoch=2010-Jul-18.0] 32 (default) [epoch=2002-Sep-03.0] SAO/2002 [epoch=1995-Oct-10.0] SAO/1995 [epoch=1988-Oct-06.0] SAO/1988 [epoch=1981-Oct-03.0] SAO/1981 [epoch=1974-Nov-09.0] SAO/1974 Orbital Elements at Epoch 2455395.5 (2010-Jul-18.0) TDB Reference: JPL 32 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3579075021671352 1.7822e-07   a 3.599323384945068 4.863e-08 au q 2.311098542747621 6.2691e-07 au i 24.39924221547497 1.8665e-05 deg node 14.91285511991158 1.6073e-05 deg peri 196.7523001954945 3.5888e-05 deg M 54.12976519592814 1.7837e-05 deg tp 2455020.472278452093 (2009-Jul-07.97227845) 0.00012877 TDB period 2494.191121438718 6.83 5.0548e-05 1.384e-07 d yr n .1443353706560956 2.9252e-09 deg/d Q 4.887548227142516 6.6035e-08 au Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A1 [EST] 1.732576243323444E-9 2.018E-10 A2 [EST] -4.848233063201061E-10 3.915E-12 A3 [EST] 1.446975473680593E-9 2.703E-10   Orbit Determination Parameters    # obs. used (total)      1785      data-arc span      15771 days (43.18 yr)      first obs. used      1975-08-11      last obs. used      2018-10-15      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .7472      source      ORB      producer      Shantanu Naidu      solution date      2018-Oct-30 15:21:19   Additional Information  Earth MOID = 1.31567 au   Jupiter MOID = .202077 au   T_jup = 2.860  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes comet total magnitude M1 9.5   01. 32 2 parameter fit from 545 observations, autocmod 2.6q comet total magnitude slope K1 14.   n/a 32 autocmod 2.6q comet nuclear magnitude M2 13.3   0.7 32 from 1065 observations, autocmod 2.6q comet nuclear magnitude slope K2 5.   n/a 32 autocmod 2.6q comet nuclear phase coefficient PC 0.03   n/a 32 autocmod 2.6q diameter diameter 8.2 km n/a Scotti,J (1994) BAAS 26:1375   77P/Longmore          Discovered 1975-Jun-10 by Longmore, Andrew Jonathan at Siding Spring Observatory, Australia discovered on plate/photo taken on discovery date Reference: comet.dis Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  Perihelion  Year (est.)  New-Style  Desig Roman  Numeral  Year/  Letter   1995.9           1994q   1989.0       1988 XVIII   1987c1   1982.2   77P/1981 A1   1981 XVI   1981a   1975.4   77P/1975 L1   1974 XIV   1975g  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-07 09:30 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin